package lab02.test36;

/**
 * Created by dell on 2017/11/9.
 */
public class Postgraduate extends Student{
    @Override
    String calGrade() {
        String grade="";
        double avg=average();
        if (avg>=90&&avg<=100)
            grade="优秀";
        else if (avg>=80&&avg<90)
            grade="良好";
        else if (avg>=70&&avg<80)
            grade="一般";
        else if (avg>=60&&avg<70)
            grade="及格";
        else
            grade="不及格";
        return grade;

    }
}
